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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da15d53bd320afc8c07602e43ac00bbb9c9b4db1a2250213012d0ca1fc9ddab6' 
  AND token = 'lXm8qeHxyDHxqzhgH8LZiwiSOvByzn+LGt5iswh4S4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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