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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13755b4ed1e3cfc1f6255b275caccaf44b56909ab1c7f43726390300c78d5d54' 
  AND token = 'L0trDdvgSVIpu/1D9cjrkMWM3MOoRifzMKFWeIiccZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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