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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108f85f0df0640c7d1339425d3977df810a3a136128953b7f4e8621982b9790e' 
  AND token = '9Nwon8v0iDacpsmYFYW1nKakA42AydBobQfcz94Ryn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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