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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef416e0df2f9ec5f1e7a689423a2d602fba38725895118ac449a3041a3f7009' 
  AND token = 'mbHVI2mVWkKtzMkPqOPj4wPOUiVSt5dAhfJK7pLmEfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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