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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc17328bb56ec7afddc40d0138767ba5ae078cb21b28d3b42d014a987d54e6e' 
  AND token = '5H52ccvNLmbSDYcGtCPXZKmO59rt4fim8frnmawE1vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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