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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38150f9f4d7d905e874dda43fb8297c1865571c54457e3234f92895ce930d7b3' 
  AND token = 'xLw+dEo9WHXr7kKvAimE9MO27aZZvSnu4+aJqiIzB34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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