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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d506a2d5260c6d9ca1cc6af48043fb34d0fd2eefa0ac907f3332f0154f070c' 
  AND token = '3NkbPS4jBfKc6lOtLC04hFthHYtvPfYNtkfBLnsoaig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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