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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f4c42943a1598aefa16f7637d8501359d8717bda8b29326da25fe52d3f5a44' 
  AND token = '8ZMyTsQIZzn49W/+o5EMdfmF/n9mVl4HiddgWm+HUQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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