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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8109315c844b20ffd486486ebd8f3b2a2af7efa70de39fcd7c3d37d02591aaeb' 
  AND token = 'Om7KbccfGWUxgH7Rvg3GghIjX2QUXmeWGhGero1KDmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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