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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd33c72f966dda48abd2c33df5f83c3faeb0653505a81f0b0fde4fb54d5bd62' 
  AND token = 'US8f/8a34RlY6tkIXAtobqWff+7Un5j9g+8yAgSdHjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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