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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9c0db68b7160c584d307fb7ce207ccce8099fcff1828071f9effa953d3c7d8' 
  AND token = 'gbGqj83T2Z36DNd5qMsrogyzn0EZfcRE2gSSgwLZ1sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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