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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dca1d61e0f4d6740653cbc65566db240ff2053f37cd9d6c193e88cbad922af9' 
  AND token = 'sdInc/lbYMem1CLdQLtWEg9CjQ2xZDbUw3D9kmxKbKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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