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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3184bcecefd7b76d3a2edc5e7d520442cdf75728b18205d0683a1e7a6b780649' 
  AND token = 'hg/wI0E37sgHmnRH6WBcXWVM4VhtfMjM3vWA7jsYk/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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