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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab9011ca06ffab8faff56bb670503ca217b9489619113f2ba6536982a2ee69c' 
  AND token = 'VrltT9KPWP+Oj+GfnQggJmzkYyqAA6O9j05DfvrFHOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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