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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e35fdaba7667166b4ee7598dd76584581768f950f80166dbeba956d918be45' 
  AND token = 'vsic9NkLeI+22b4Q6vdPQ66szI/HkHL5yzCs3RbWrFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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