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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d36126e965d0e6358cd1a8d3c1d36422fe08452d6e0782b9003764a3346466c' 
  AND token = 'MmyIxILNq9jHVFv4qRSIgnFH+hc67LK6jtO7DNC7zpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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