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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b52bac158975dc2c6e3caa4b4317adc361dd1fbc786374fa59c51ce03f50d39' 
  AND token = 'QjnZKcX0FrQrT1og5XH6E+fx53ccRyIIwDQT+4wrxGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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