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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a1cb073c46f6cdbbfd42bfe4af2873dc66d8027fe6f6720b76adcf308751e' 
  AND token = 'MOkQPUfIOV8f40qS1jUP1Evn/Uy5pKJaiNCf9OyEz6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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