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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e13f50020247a5062801716f6c5bdd4d1a2f7d3704d17b4f5542e6e4affd77' 
  AND token = 'jmKAEcESjZBGmJ9U3iQS/jY9SKuow8a5MjImQgMra8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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