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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318b64519d1df0bf9ac3955dd0f62d6acc192f425028af02fbf084ef95c05f5a' 
  AND token = 'CPV76grPd5Ww4rz6Vmr/wpNID0o46k4jcWNEFN8rZgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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