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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1127979eb62e24d51b75cf373cb57f65870edb230516b9c298d94045716aef0f' 
  AND token = 'NNkc18jg9ZBaEOQOQvKWOAvID3cOXxGoFjZiAp4+kU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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