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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72752fbe4b16facff67843b24650e0950998fbb3fb850a6b06f4e8ad51e052b5' 
  AND token = 'ExVMERXTyySjFo/NLJ70MwS7nTCjf6Z3UIfo4ze12+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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