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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4be6112df1df717a19acdc6ffea8be8b3b1398e3a87a5c829aba9e255406c49' 
  AND token = 'FBl46BPOO+ZBh1m0dgHMl09F9lBZtHD9Dic/3knoo6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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