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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8999c1fa5bc5026ff73aeef66f1a71cd22fee813de69b761a0df3aadc8d3b86a' 
  AND token = 'XVb0dPqg/e7H1NJlEKCY5t3BbGriQ2KZCND/tXW0gy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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