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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe272b2b5a45470a9de6967c022d1885032a47be07f485a9a36f8fa70450230' 
  AND token = 'c+DzCiG6v3OnfVdvm77fbg35cGc4qlLe2fgsqcmuunI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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