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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea4e3473bfaecc7d98a2ae4119311e3d261dcfd57dd442c6c5eb918213a06cd' 
  AND token = 'tQKXAp9ckfdcMVFg2mN2Cyexa9AVgBBfb93YCo8rNv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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