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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2701c55ced46e7b184ad0e563827e5e760ed1892a4742bedaa2b0a947f9729' 
  AND token = 'evwi2R+BaQIBHaJLDxpYAEbw+bLbgUYHyqUeVi+138A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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