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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdd7482b36155e78dce283d7e8998155b1953ab28cdfff56211ff2dc75f9501' 
  AND token = 'coOkYxX8+uj8VkP2qdmnnoLnLrznt+tC4ahwNgyh0AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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