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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1311b12438361ff812528355b4e6a8e540ad5cfb6565562299d60359f97fd53e' 
  AND token = '1FblWz7aBIAuznCM1bNNM87cYeyMfhYQ1zS9d8eyE1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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