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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daa13911b3024ee735dd82cb34aaaf21c70edefc9c85f3bc84f51c9473131d0' 
  AND token = 'Yn2AuwmB3KSpFnmS4R5+PHEaEwPzvmf7jL8zhwknovM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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