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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d274dd82efb6c0b8267a422e86cdddddc8ab98b8c1f1e1bc2ea3b483f63dcef' 
  AND token = 'r/XOfFHPmmi5gTzB3kukLkt3MQ6EWSIhQ2Rkp96bp+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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