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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ea124974cb611b24681dafb9d361739484c95cd1db580ded8253e386d243b4' 
  AND token = 'hf5Np/vT0JsKZd64AXZAlFbUS4N8lHffYWeACTBocKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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