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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3501f469c03f49bcd95ab044a4226e3fed6075c7bc2309412f4d7b3aee5b89' 
  AND token = '8sScBzB2Ibzo6K30w7MGjyFhwiPs1DINWkj+YzGay4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}