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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b61a7e0afb21725cdb8864620e41469e22ae5f19ab39665bb3081ff228ac38c' 
  AND token = 'tk4OumRUA3hANHUVv/WV7FrKSAIpmHni0y3McGDkm6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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