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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eb3c8cd9cfccf6bec814fb78e3daf9797fca867ff4c1c00516a7247704e39a' 
  AND token = '4QuSsvo3UatAWCxCRt4epMlW1/6nTYeHaTLA0fvFD6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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