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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5626f48d2acc3c8c105c2ee432d9a5970e7bbf15d9dc34ef266de61e1834ce60' 
  AND token = 'BHOZF/xxI3+T1SXat1hdcd/7WcSjQGS0Vzr7tL+qGpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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