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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3c8536a5ecc37d62d73f4ea34a668a061711cd3cbaa9988eda5f360ff96a6e' 
  AND token = 'p3xo9JhkDReSYo87HI+OijlxM+K2AD52GQpcUhtBzX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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