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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa9802072423d1d3e2578a7282d94b686e758b6d49c3febba031e600f8e697f' 
  AND token = '1qgLLl5mRCOUsJw++09BJ+AMeKQhi23m7fCwim0E1LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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