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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40de3165988e07dee8e07e08839eb95d6d4ed839f936f05ae6187438b805da8b' 
  AND token = '8vFBX17TcF/hWmxJn00gOTCFOmMMc4cubFYassD2m7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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