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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02eb1c65bcc01d26cb31479b776ddefffa54c67e47dab439805f759f52d72920' 
  AND token = '+ghVXke9UATbaC+N1bGtH5HwE1DFnJ1TcCposlfy724=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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