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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cc2aafa96746a8681a5c126dd9d70da17884197f9d4a59ca9f35ec983ebb5c' 
  AND token = 'EjKNjnv9hrKHujQ0zwQ8jS7joNjhr82tc0n3X0sTuf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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