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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5892abc4ab383d876ef5713bd5f9b2d56432ab9996e1302322108b0820e5af57' 
  AND token = '3Ue+dx8soRXVnMB9TaYhczv7w5hgEa+iZe0QuuMyoC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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