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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b18a3122f2b3363897da6c0a0ea5591d2bb1336b36346c56ed7260f1e6817a8' 
  AND token = 'eSoedgyiC47J6eetW2KqTjHjcNo6T2nUOxnu9dE0kKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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