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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12866a092efb4a7c37d214d910ae7a3643d787ec86eede8ea5708ddab57ca5e0' 
  AND token = 'pBFTPoE/xt9LSqfp02my3PqZ1wc2eyn8z+mC7Wi1BPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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