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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288807643fa62098392b6b16f1a1f2fa89be21d8b1d35978ff88b1ae448a8f71' 
  AND token = '8FcsE6OCmzaLCM01PFi4fY86m9AlZI4Aszs8HJBnaRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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