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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa59db26067f306cf6dd7e8414ca27e7ff1a1bfe6908d5725d6cc2c3c352773' 
  AND token = 'QBbrUlGPCikkcKT8XUxePCjsigxRYc0a04Fr30d6MKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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