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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea62f1e9cd63a3799e1b48a9729a53b1edb35c9e4e0988f6e0fb50cab552c03c' 
  AND token = 'hzDIOAtnbt4LeHkogSnGOKdiW/y+3CPghMeX994Emxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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