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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b492b2994b742d886197d752100f557bbffca06dd7b8e6e5af2029aca993ab13' 
  AND token = '8SiN/sTkSjXoUunhJsQtpLap4yr68QyrXANw6viE6I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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