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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb10535372ce751cf376bddaeb2ee8c8c48c61bc7265a9ad0429ff2f85e3d5f' 
  AND token = 'cZpBSkm4awl15nQN4dmAfIjxB3GB/f8T1wPU4IXGlEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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