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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a057d6fce2cf0be16d9eddc08dbc326250a63ebc24941a92650481a7a551563f' 
  AND token = 'XDirDF64KOq4c+nLSVwbtxrpNf7T9e0AeKSNmcd2LEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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