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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4e4d901a50ee7d6297d2b1b3f2a177ec586536fc04b9de117cf6a57b3dd602' 
  AND token = 'UedRySSkhCBn6wDdpTlXEX8FwIxv748l6iBrPTTa7uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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