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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e902fc141774d6237b19f63e32e97791d06bb19ae27d3cd4d33b4a7b31378c' 
  AND token = 'Jq31z48+U275meCQjexdTK/Q9EEeW3xmOjghnjryMEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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