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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e554f3e72e55b75ebe0ff7759c88065247fa62c4f43bbb33504b83ad5ebf794f' 
  AND token = '8Y2NcPLbt6tKYF+0B+2F//Q4H1s1xOWVV2eKEJnNwkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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