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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd97ae4e9e32db73c042ed56d26a4a9cd02cd8896e8de8a42ee26d4f414acbba' 
  AND token = 'gLsfA57DBHUiBzVlIbY1GHJvECx20fiEgdIX3GWXneE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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