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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c93050f96bfe671ed4055d61d062fc7095f0f1a714a233a1cf04fe0e9a251ec' 
  AND token = 'JHLXamk3/zUa+jK2wogH21/2GULiTnzp50WGW0rPC+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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