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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f64501515fc7ad3bbd8e49895478c4cf5552c145ce516070ede77c53a0860c0' 
  AND token = 'aSX7rdOSpanRdY90HOIA5mqZn7BxlVZPHOwS9OQBFdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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