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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcc4de861f9c61cafaa01ac60bbc2bd25f81b02bce41cc2b840a780c6124ef0' 
  AND token = 'vgb/z+16xzKWysLGXYj9wtXJ1abkoFf2n8swGkVNviQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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