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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7274445287e316c23682dfb85256af4319934f239ccf01ea2e1b98c98e566f1' 
  AND token = 'chZxhN83Da9M2yBkSHk4WY5MzIM5N+dM1IgGIFyX5so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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