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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1756c2a9b2bd4e8c611f78caecaa90d5d1ace1bae416312c4140c27b18cb1c73' 
  AND token = 'Gyx63OHPTZ97QYRXU5O/iOY2ts6BMZnyeZZ5RI3Rm9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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