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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138dc5d67edc9c52fe20e263d38e19865e269305efcc3bf3d3a2fb591acc1e86' 
  AND token = 'WAiIdXvCojc8EAlUy7Hb/CrxruXNHbJ/jxA8asxeS/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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