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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e2de833a34e38c9901ed012465f85f948fbcb86b11bd54321f8b482c8ae8f6' 
  AND token = 'rbUnXN7TJS8zOEwUIKQODyUf306tQJB7lJE5MQOvRac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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