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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71895daa5ef0ff62b19a7156eca5a2811da741fc640082bdd7193feff8ec820a' 
  AND token = 'zBF2nscBsKS/6veREWD0MlGxgM0AxoWHxsqq9s6pV5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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