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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba01d5a71c2bb29dabcb0e7a4c933e29412d7463d55c877de33522c5347d461' 
  AND token = 'vt60HZt9e6zD/DMmh5QbE8AVkKiVW46QiN1NbQm6x8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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